role in cardiovascular disease

...may arise abnormally from a pulmonary artery rather than from the aorta, with the result that deoxygenated blood instead of oxygenated blood flows through the heart muscle. Abnormal openings, called
coronary arterial venous fistulas, may be present between the coronary arteries and the chambers of the heart. One or more of the three main coronary arteries may be absent. While these abnormalities...